Diamond lathe tool



July 10, 1928.

A. SIMONS DIAMOND LATHE TOOL Filed March 20,. 1925 INVENTOR HERA/1AM fimo/vs ATTORNEY 3 I stantiall securedtothem'b4.

'imbedded in the nib, and then grind t Patented July 10, 1928.

UNITED STATES PATENT OFFICE.

mm smons, or new Yonx, N. Y.

DIAMOND LATHE TOOL.

Application filed March 20, 1925. Serial No. 18,878.

My invention relates to proved diamond lathe tool.

One of the objects of my invention is to provide aturning tool having a diamond point, in which the point will be so mounted that the tool can be used in a lathe for turna new and iming surfaces made of material such as phether objects of my invention will be set Y forth in the following description and drawings, which illustrate a referred embodiment of my invention. he foregoing general statement of the objects of my invention is for generally explaining it, and not for pur ses of limitatlon.

7 1g. 1 is an elevation showing the tool in the position in which it can be used as a left-hand tool.

Fi 2 shows the tool in the position in whic it canbe used as a right-hand tool.

Fig. 3 is a view on the line 3-3 shown in Fi 2, in the direction of the arrows.

ig. 4 isa detail sectional view, partially rspective.

e tool holder 1 is made in the well known manner and the tool shank 2 is mounted in an opening or bore 5.- The cross-section of the holder 1 is substantially tangular and the axis of the opening 5 throu h opposite edges of said holder 1 so that each end of "said openin 5 extends into at least two adjacent faces of the holder 1. The front of the opening 5 also extends into end faceof the holder 1. I prefer to make the cross-section of the holder 1 sub- 2 is hel in position by-a in 6.

The front of the tool hol er 2 is provided with a metal nib 4 firmly secured thereto, and an elongated ta rin diamond 3 is he road end of the diamond is at the base of nib 4, to hold the diamond in position. I prefer to firmly imbed the diamond 3 in the nib 4 so as to firmly hold it in lace. I

I prefer to im the diamond 3 in the nib 4 so that the diamond is first com letelg e en of the shank 2 so as to expose the point of square. The tool shank or shank;

intersecting said holder, ing in-front of the the diamond and the adjacent part of the tool and give it a pyramidal shape; The

three pyramidal faces thus formed have equal angles and are symmetrically disposed with respect to the central longitudinal axis of the shank 2, which is of cylindrical form.

If desired, the tool can be turned.

The front end of the holder 1 is shaped so that the plane thereof is substantially parallel to the adjacent p amidal face of the diamond, as shown in 4 and inclined with respect to the longitudinal axis'of the holder. The rear of said lid is preferably arcuate in form. 4

The diamond has two lateral cutting edges,

whose plane makes an angle of less than ninety degrees with said longitudinal axis. The angle' of the lateral cutting edges with said longitudinal axis is shown in Fig. 4,.which also illustrates how the third cutting edge of the diamond is inclined away from said longitudinal axis. This third cutting edge may, for convenience, be ed as the longitudinal cutting. edge.

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configuration of the diamond ena each designat This I cutting edge thereof to have the proper clear ance with respect to the article acted upon. The ti of the diamondpoint is on the longitudina axis of the shank 2.

It is clear that the diamond point has three substantially similar triangular faces, two of said faces bein substantially symmetrically disposed wit respect to two adjacent longitudinal faces of the holder, and

that the front face of the holder makes an angle ofless than ninety de ees with the longitudinal axis of said hol er.-

I have shown a my invention, but it is clear that. numerous chan and omissions could be made without eparing from its spirit.

I cla1m:-- j 1. In combination, a holder ha a plurality of longitudinal and substantially planar faces, adiamond point tool havin a shank located within and connected to said holder, lon 'tudinal of the holder the front of sai shank having two of the. adjacent faces of the tip' of said diamond projectdiamond having a lurality 2. In p pluralit of planar of cutting edges. combination, a holder having ,;a longitudinal substantlally aces, a diamond point tool having a preferred embodiment of said shank beinginclined to the.

an exposed diamond and front of said holder, said sh'ank located within and connected to said holder, said shank being inclined to the longitudinal axis of the holder, the front of said shank having an exposed diamond and intersecting two of the adjacent faces of said holder, the said diamond having three like and symmetrically disposed triangular faces so that it has three cutting edges, the tip of said diamond projecting in front of the front of said holder,-two of the faces of said diamond being adjacent two of the longitudinal faces of said holder and being symmetrically disposed with respect thereto.

3. In combination, a holder having a substantially square cross-section, said holder having an opening adjacent the front thereof intersecting two opposite longitudinal edges thereof, the said opening being inclined to the longitudinal axis of said holder and intersecting two adjacent faces of said holder at the front thereof, a diamond point tool having a shank located in said bore, the said diamond bein partially exposed and being ground to orm three substantially similar and symmetrically disposed triangular faces, two of said faces being substantially symmetrically disposed with respect to two adjacent longitudinal faces of said holder, the front face of said holder having an angle of less than ninety degrees (90) with the longitudinal axis thereof.

In testimony whereof I afiix my signature.

ABRAHAM SIMONS. 

